Joseph h



J. H. PICKARECK.

ELECTRICAL SWITCH.

APPLICATION FILED MAY 12. 1916.

1,825,042: Patented Decn16,'1919.

uurran STATES PATENT; ornion.

JOSEPH H. PIOKARECK, 0F DETROIT, MICHIGAN, ASSIGNOR TO DETROIT FUSE AND MANUFACTURING COMPANY, OF DETROIT, MICHIGAN, A CORPORATION OF MICH- IG-AN'.

ELECTRICAL SWITCH.

Specification of Letters Patent.

Patented Dec. 16, 1919.

Application filed m 12, 1916. Serial No. 96,967.

To all whom it may concern:

Be it known thatI, JOSEPH H. PIGKARECK,

a citizen of the United States, residing in' the city of Detroit, county of Wayne, and State of Michigan, have invented certain new and useful Improvements in Electrical Switches, of which the following, taken in outline having its ends or extremities reduced in thickness and received within apertures provided in the knife-blade contacts, the latter being provided with suitable projections, which project through corresponding apertures formed in the cross-head and riveted over to securely retain both blades and cross-head in rigid operable connection.

In the accompanying drawings, I haveillustrated one preferable embodiment of the invention,

Figure 1 being a perspective view of a switch mechanism of the protected type embodying the invention, and Fig. 2 an enlarged detail in perspective.

The knife-blade contacts are indicated by the numeral 1. These are pivotally mounted at 2 to supports 3, which are in electrical connection with the binding posts 4. The

free ends of the knife-blade contacts 1 cooperate with the jaw contacts 5, which in turn are electrically connected with the binding osts 6 through the fuse holders 7.

The kni e blade contacts at ,a point preferably adjacent to the free ends thereof are notched or cut away as at 8 leaving inter mediate projecting tongues or lugs 9 which cooperate with the ends of the insulating cross-head 10. This cross-head may have its extremities reduced in cross-section and is provided with rectangular a ertures for the reception of the tongues or ugs 9. The reduced ends of the cross-head extend below 65 the upper edge of the knife-blade contacts,

as clearly shown in Fig. 2, so that suitable apertured metal washers or plates 11 may be placed over the top of the lugs 9, the latter being then riveted thereupon to securely fasten and rigidly connect the crosshead with the knife-blade contacts. thlckened portion of the cross-head intermediate the reduced ends fits snugly against The the knife-blade contacts as at 12, thus forming shoulders which aid in holding the knife-blade contacts properly spaced and also adds the desired rigidity to thestructure as a whole. The cross-head is provided centrally with a connecting member 13, which has operable connection with a crank 14 by means of which the mechanism is operated. By connecting the operating member 14 with the cross-head at apoint substantially intermediate the knife-blade contact, a balanced pull upon the knife-blade contacts is efiected when the mechanism is operated to make or break the electrical circuit.

While I have illustrated and described one preferable structure in which my inven-- tion may find embodiment, I do so by way of example only as changes may be resorted -to without departing from the spirit and Having thus described my invention, what I claim as new herein and desire to secure by Letters Patent, is

1. In an electrical switch, in combination, a pair of spaced knife-blade contacts, a pair of cotiperating spaced jaw. contacts and a crosshead of insulating material connecting said knife-blade contacts, each of said contacts having two portions cut away to pro: vide an intermediate lug, said crosshead being' apertured near its ends to receive said lugs, the ends of the crosshead fitting within the-cut away portions of the knife blades, each lug being passed through an aperture and the lugs being riveted over the crosshead to prevent separation of parts.

- 2. In a switch of the character described, the combination of a pair of pivoted knifeblade contacts, a pair of cooperating jaw contacts, a cross-head connecting the knife- I ing through the cross-head and riveted there over to prevent separation of the parts.

3. In a two-pole switch of the character described, a pair of pivoted knife-blade contacts, a pair of fixed cooperating jaw contacts, a connecting member extending across and joining the knife-blade contacts to move them in'unison, said knife-blade contacts being provided with fastening lugs and apertures on their longitudinal edges for receiving the ends of the connecting member, said lugs being riveted over the top of the connecting member to hold it in position.

4. In an electrical switch of the character described, the combination of a pair of pivoted'knife-blade contacts, a pair of spaced cooperating jaw contacts and a cross-head connecting the knife-blade contacts whereby the latter are kept in parallel relation and in alinement with the jaw contacts and fastening means for connecting the cross-head to the knife-blade contacts including an integral lug along a longitudinal edge of each of the knife-blade contacts, extending through suitable apertures in the extremities of the cross-head, washers positioned upon the cross-head and held in place by the riveting of the extremities of the lugs of the knife-blades upon the washers.

5. In an electrical switch of the character described, the combination of a plurality of spaced knife blades having recesses in their longitudinal edges, and lugs formed intermediate said recesses, of a cross head having apertures therein to receive said lugs,

and reduced portions fitting within said recesses, said lugs passing completely through vsaid cross head and being riveted at their ends.

6. A blank for a knife blade electric switch, comprising a fiat rectangular strip of metal which is provided near one end with means for pivotally mounting the strip, said strip having two notches or cut-out portions along one longitudinal edge thereof to provide an intermediate lug for attaching a crosshead.

JOSEPH H. PICKARECK. 

